A STOCKPILE of previously unreleased video and audio recordings and love letters Madonna sent to an ex-boyfriend are set to hit the market — and provide insight into the Material Girl’s romantic side.

The personal artifacts, which can be bid on in the online Rock & Roll Pop Art Auction, include two microcassette tapes of answering machine messages Madonna left her long-ago ex-boyfriend James Albright, a former security guard at defunct Manhattan nightclub Limelight who later became Madonna’s bodyguard, and 21 love letters she faxed Albright from various hotels around the world. The seller’s identity is unknown.

Also for sale is a 15-minute, extended-footage VHS tape of her from Abel Ferrara’s 1993 film, “Dangerous Game,” co-starring Harvey Keitel and James Russo. In the tape, a portion of which appears as a movie-within-the-movie, Madonna appears to snort cocaine, inhale nitrous oxide and expose her breasts while allowing Russo to snort cocaine off her body.

In the letters to Albright, Madonna frequently refers to herself as “Lil’ Booty” and “Lola Montez” — in honor of a famous mistress of King Ludwig I of Bavaria. Her nicknames for Albright include “Booty,” “Ceasar” (sic) and “Sambo.” In one fax, she writes to Albright, “Just watched the HBO special. It was OK. My booty looked good and you should see how good it looks in person. It looks Bootyful!”

Bidding on the microcassettes starts at $25,000. The letters can be had for $3,000 while the VHS tape starts at $10,000. Neither the audiotapes nor the video come with copyright, meaning a new owner won’t be able to resell the tapes.